Works in every mode and gives you a dotted line around the remove area

xweight X-Y Weight (0%-100%) [50]

Only in xy-mode(2). How much of the horizontally interpolation is used

0 means 0% horizontally and 100% vertically interpolation.

35 means 35% horizontally and 65% vertically interpolation.

50 is mostly the best choice.

fill Solid Fill Color (RRGGBB) [000000]

Only in solid-mode(1). RGB color value in hexadecimal numbers in the format RRGGBB.

fill=9A01CD (Purple)

file Image with alpha/shape information []

A grayscale image file with the alpha mask, that tells the filter where and how much to render. In shape mode it also used to get the position of the pixels for the interpolation. The first white pixels around a render position are used. The size have to be exacly the same as given with the 'size' option